Apparatus for drying lithographed metal sheets



T. L; TAL|AFERRO.- APPARATUS FOR DRYING LITHOGRAPHED METAL SHEETS.

' APPLICAT-DN FILED APR.15 1920. 1,399,415. Patented Dem 6, 1921.

2 SHEETS-SHEET I.

snow/Miler 0 7 mm? wuimw Gum/megs T. L. TALIAFERRO.

APPARATUS FOR DRYING LITHOGRAPHED METAL SHEETS.

APPLICATION FILED APR.'15, I920.

2 SHEETSSHEET 2- :2, fk g.

UNITED STATES",

PATENT. OFFICE.

THOMAS LUCIEN TALIAIEBRO, OI CHICAGO, ILLINOIS, ASSIGNOR TO PHOENIX EERMETIC COMPANY, OF CHICAGO, IIIJINOIS, A CORPORATION OF NEW YORK.

L'PPABATUS FOR DRYING LITHOGRAPHED METAL S HEETS.

To all whom it may concern Be it known that I, THOMAS L. TALIA- FERRO, a citizen of the United States, residing at Chicago, in the county of Cook, State of 'Illinois, have invented certain new and useful Improvements in Apparatus forDrying Lithographed Metal Sheets, of which the following is a description, reference being had to the accompanying drawing and to the figures of reference marked thereon.

The invention relates to new and useful improvements in an apparatus for drying lithographed sheets.

An object of the invention is toprovide a .drying oven,wherein the temperature may be kept uniform or substantially so from end to end thereof so that the sheet as it enters the oven will at once be subjected to the intense or high heat of the oven.

A further object of the invention is to provide a means for closing the entrance and the exit of the oven which will readily permit sheets to pass therethrough continuously one after the other.

A still further object of the invention is to provide means for circulating the heated air within the oven for further aidin in securing a uniform temperature 0 heat throughout the entire reglon of the oven.

A still further object of the invention is to provide a drying oven wherein a continu- V ously moving conveyer presents the sheets in vertical position tothe drying temperature of the oven and maintains the sheets in vertical position for a considerable period of time after they leave the oven so as to bring about a thorough coolin of the same. These and other objects will 1n part be obvious and will in part be hereinafter more fully disclosed.

In the drawings: Figure 1 shows more or less diagrammatical'ly and in longitudinal'section a drying ovenembodying my improvements, and

- Fig. 2 is a transverse sectional view of the same.

In my prior Patent No. 1,318,187, granted October 7, 1919, I have shown and described a dr ving or baking oven through which an endless conveyer passes, and which is adapted to hold metal sheets in vertical position and to continuously pass the sheets one after another through said oven. 7 The present inyent n s di c ed o an oven t he above Specification of Letters Patent.

Application flledApril 15,

placed between each pair of arms.

. continuous bla Patented Dec. 6, 1921. 1920. Serial ma 374,033.

so as to bring about a uniform temperature,

which particularly adapts the oven for a drying oven wherein the sheets are heated to a relatively hi h temperature or from two hundred and fi y to three hundred and fifty de recs. eferring in detail to the drawings, my improved oven consists of a supporting structure 1 having a closed body portion or casing formin a drying chamber, prefer ably formed 0 corrugated metal covered by suitable insulating material as shown and described in my prior patent.' The sheets are conveyed through the oven by means of an endless conveyer 3 having vertically extending arms 4-4, between which the sheets are placed. At the receiving end the sheets are fed by means of a conveyer 5 between these vertical arms 14, one sheet being he sheets are then carried in a vertical position by the conveyer and while held in'vertical position, are'carried through the oven. The entrance openiiig 6 of the oven is slightly larger than the sheet so as to permit the same to'freely pass into the oven. The same is true of the exit opening 7. The entrance cold air. This is accomplished by providing a pipe 8 which is connected to a suitable source of air su ply, under pressure, and a ct of air, indicated at 9 is formed, which is parallel with and substantially covers and closes the opening 6. At the exit end of the oven there is a similar. pipe 10 which forms a blanket of air 11, likewise closing the exit end. This blanket of air efit'ectively prevents the heat from escaping from the oven, and at the same time, permits the sheet to readil pass into the oven.

The oven is provi ed as shown in thedrawings with suitable burners 12 whereby the ovenmaybe heated. Suitable openings 13 adjacent eachburner providemeans for allowing air to enter the oven, and an opening 14 controlled by a damper 15 permits some of the air to escape, thus the fumes from the sheets being dried may be carried oft through a chimney or the like. In the upper "part of the oven there is a pi e 16 extending from end to end thereof which is I formed with openings, and this pipe is connected by suitable meansto a source of air supply so that a small quantity of air may continuously issue from said openings and thus stiror cause acirculation of the heated air within the oven. This tends to bring about a uniform temperature throughout theentire extent of the oven. I

My improved drying oven is particularly adapted for drying .lithographed sheets of metal and order to bring this about, it is desirable to heat the sheet just as quickly v, as possible to a high temperature, maintain p the oven, the temperature of the oven is i length and therefore'the sheet will pass from.

it. at this high temperature for a given length of time, and then cool the sheet uickly. By'this process of drying, which is s own, described and claimed in my coendin led 0 even date therewith, I am able to ver quickly dry litho raphed sheets and witout causing any cfiscoloration of the pigments-of the ink. The discoloration of the pi ents of the ink is brought'about throng the extended heat at' a relatively high temperature. 'By confining the heating toa short interval of time, such as four or five minutes, and the quick cooling of the sheet, this discolorationds prevented. By the use of the air blankets at the ends. of

substantially uniform throughout the entire atmospheric temperature to the temperature of the oven qulckly, as the temperature out 1 side of the air blanketand adjacentthereto is substantially atmospheric temperature,

and the temperature inside the air blanket oven, it will pass from this maximum temand adjacent thereto is substantially the maximum temperature of the oven.

The same is true asthe sheet passes from the application, Serial No. 372,055,

perature very quickly to atmospheric temperature. length outside of the oven, and as the sheets pass along in vertical quickly cooled.

It is obvious that changes in the form of construction of the oven may be widely V84 ried without departing from the'spirit of the invention as set'forthin the appended claims; v

Having thus described the invention, what I claim as new and desire to secure by Letters-Patent, is f r l. A drying oven including in combina- The conveyer is of considerable position, they will be.

tionm casing forming a drying chamber,

means for heating the chamber, said chamber having inlet and outlet e enings, an

endless conveyer passing throng said openings and said chamber for carr mg the sheet through the oven, and means 'or projecting a blanket of air across the inlet and exit openings. 2. A drying oven :including in combina- -tion,a casing forming a drying chamber,

means forheating the chamber, said cham-- t through the oven, means for projecting a blanket of air across the inlet and exit ope'nings, means for causing a circulation ofheated air withinthe oven, and said endless -conveyer having means for holding the.

sheets in vertical position;

. Intestimony whereof, I aflix my signature.

THOMAS LUCIEN TALIAFERRO. 

